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Bug 1260581 - (CVE-2015-8777) CVE-2015-8777 glibc: LD_POINTER_GUARD in the environment is not sanitized
CVE-2015-8777 glibc: LD_POINTER_GUARD in the environment is not sanitized
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20150905,reported=2...
: Security
Depends On: 1260583 1276761 1383951
Blocks: 1260582 1415638
  Show dependency tree / graph
 
Reported: 2015-09-07 06:13 EDT by Adam Mariš
Modified: 2017-08-01 14:12 EDT (History)
12 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was found that the dynamic loader did not sanitize the LD_POINTER_GUARD environment variable. An attacker could use this flaw to bypass the pointer guarding protection on set-user-ID or set-group-ID programs to execute arbitrary code with the permissions of the user running the application.
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Environment:
Last Closed: 2015-10-21 06:29:23 EDT
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Sourceware 18928 None None None Never
Red Hat Product Errata RHSA-2017:1916 normal SHIPPED_LIVE Moderate: glibc security, bug fix, and enhancement update 2017-08-01 14:05:43 EDT

  None (edit)
Description Adam Mariš 2015-09-07 06:13:32 EDT 
A weakness in the dynamic loader has been found, making glibc of versions prior 2.22.90 affected. LD_POINTER_GUARD in the environment is not sanitizaed allowing attacker to easily bypass the pointer guarding protection on set-user-ID and set-group-ID programs.

Reproducing steps available at:

http://hmarco.org/bugs/glibc_ptr_mangle_weakness.html

CVE request:

http://seclists.org/oss-sec/2015/q3/504
Comment 1 Adam Mariš 2015-09-07 06:17:29 EDT 
Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 1260583]
Comment 3 Stefan Cornelius 2015-10-21 06:28:33 EDT 
CVE has been requested, still no response:
http://www.openwall.com/lists/oss-security/2015/09/05/8
Comment 5 Fedora Update System 2016-02-17 07:49:42 EST 
glibc-2.21-11.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 6 Dan Callaghan 2016-02-17 21:40:40 EST 
Seems like WONTFIX is not the correct resolution here?
Comment 8 Martin Prpič 2016-07-07 03:56:53 EDT 
Mitigation:

The glibc pointer guard is a post-exploitation mitigation mechanism.  As such, it is only relevant if there are exploitable security vulnerabilities in the system.  Therefore, applying available security updates to the system is a possible mitigation for this issue.

In typical deployments, environment variables can only be set by users with shell access.  Restricting shell access to trusted users is another possible mitigation.
Comment 10 errata-xmlrpc 2017-08-01 14:12:37 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1916 https://access.redhat.com/errata/RHSA-2017:1916
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